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| Titel |
Deep and Shallow Structure of the Taiwan Arc-Continent Collision |
| VerfasserIn |
John Suppe  , Yih-Min Wu, Sara Carena, Kamil Ustaszewski |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250037045
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| Zusammenfassung |
| The on-going oblique arc-continent collision in Taiwan between the Luzon arc and the
Eurasian continental margin provides a classic spatial view of the temporal evolution of the
collision. In addition Taiwan is a well-known site of critical-taper wedge mechanics and
erosional forcing of deformation, leading to a mountain belt that is approximately in
topographic steady state, with erosion balancing the compressive flux. This classic picture,
based largely on surface and upper-crustal data, is now being illuminated at lower crustal and
upper mantle levels with high-resolution local seismic tomography and earthquake locations.
These new data document in 3D that the deep structure is remarkably independent of the
shallow thinned-skinned mountain belt. Here we show that the lower crust and upper
mantle of the Eurasian plate undergoes a transition from normal subduction and
accretionary-wedge tectonics south of Taiwan to a strongly localized progressively
bent geometry with a vertical to overturned plate interface. The lower crust and
Moho of the Eurasian plate is vertical to overturned to depths of 70-80 km under
central and northern Taiwan. In this region the deep plate shortening is accomplished
by folding of both the Eurasian and Philippine-Sea lower lithospheres without a
classic active subduction zone, whereas the crust of both plates above the main
detachment is mechanically and kinematically separated from this deep shortening. |
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